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建立了用于过滤燃烧数值模拟的大孔穴多孔介质3-D均质网络模型。利用该模型研究了四组不同参数多孔介质内压力梯度与渗流速度之间的变化规律。数值模拟与实验结果吻合得很好。数值计算表明:相对于孔隙率,孔径亦即渗透率对压力梯度的影响更为显著;入口效应仅局限在距入口界面2～3个单元长度内,几何参数和渗流速度对其影响可以忽略;多孔介质的存在抑制了湍动能的发展,在受入口效应影响的区域,湍动能衰减得比较剧烈,之后变化趋缓,最终与耗散率形成动态平衡。
A 3-D homogeneous network model for macroporous porous media was established for numerical simulation of filtration combustion. The model was used to study the variation of pressure gradient and seepage velocity in four groups of porous media with different parameters. The numerical simulation is in good agreement with the experimental results. The numerical results show that the influence of pore size, ie permeability, on the pressure gradient is more significant than that of porosity. The inlet effect is only limited to 2 to 3 unit length from the inlet interface. The influence of geometrical parameters and seepage velocity can be neglected. The existence of porous media suppresses the development of turbulent kinetic energy. In the region affected by inlet effect, the turbulent kinetic energy decays more intensely, and then changes slowly, eventually forming a dynamic balance with the dissipation rate.